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Image forming apparatus

Active Publication Date: 2018-08-23
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a method to prevent adverse effects on images caused by injection charging while also reducing developer degradation in systems that use simultaneous developing and recovery. The technical effect of this patent is to provide a way to prevent these adverse effects without affecting the quality of the image being formed.

Problems solved by technology

Such behavior of injection charging may not only create a problem in that surface potential of the photosensitive member varies in accordance with a variation in the humidity environment but may also cause adverse effects on images such as a ghost image due to an injection amount being changed by the amount of toner interposed between the photosensitive member and the charging roller.
However, as described above, with image forming apparatuses adopting simultaneous developing and recovery, since the fogging developer is also recovered by a developing apparatus to be reused, a problem may occur in that an increase in the fogging developer amount facilitates developer degradation.
It is an ongoing problem to be solved to suppress both adverse effects on images due to injection charging and developer degradation.

Method used

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Experimental program
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first embodiment

Image Forming Apparatus and Cleaner-Less Image-Forming Process

[0028]FIG. 2 is a diagram showing a schematic configuration of a printer 100 as an embodiment of an image forming apparatus according to the present invention. FIG. 2 is a sectional view as viewed along an axial direction of an image bearing member in a normal installed state. It is assumed that upward and downward on the drawing represent vertical directions and leftward and rightward represent horizontal directions.

[0029]An image forming operation will now be described with reference to FIGS. 2 and 3.

[0030]When the image forming operation is started, a photosensitive drum 1 as an image bearing member is rotationally driven at a peripheral velocity of 150 mm / sec in a direction of an arrow in FIG. 2 by a drive motor which drives the photosensitive drum 1.

[0031]A charging roller 2 is used as a charging member which charges a surface of the photosensitive drum 1. By the time the image forming operation described below start...

second embodiment

[0049]In the present embodiment, an injection charge component is measured and controlled.

[0050]As shown in FIG. 1, the injection charge component can be measured when a discharge start voltage (Vth) or, in the present embodiment, 600 V is applied to the charging roller 2 as a bias (Vpri). Measurement methods include measuring a surface potential of a photosensitive drum using a surface potentiometer installed in the apparatus main body and measuring a value of a current flowing through the charging roller using a galvanometer. In the present embodiment, a time for measurement is provided during a forward rotation using a surface potentiometer installed in the apparatus main body. Specifically, control is performed so as to change the developing bias in accordance with an injection charge component detected by a surface potentiometer or a galvanometer while suppressing the amount of the developer recovered in the developing device 4 by causing the developer to adhere to the developi...

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Abstract

An image forming apparatus includes: a photosensitive drum for bearing a developer; a charging roller that comes into contact with the photosensitive drum at a different velocity and that charges the photosensitive drum; a transfer roller that transfers a developer image on the photosensitive drum to a recording material; a developing sleeve that supplies a developer to the photosensitive drum and that recovers a developer on the photosensitive drum after transfer; detecting device for detecting information relating to injection charging; and a controller that, based on the information, controls an amount of a fogging developer, wherein the controller controls the amount of the fogging developer during image formation according to information detected by the detecting device while suppressing the amount of the developer recovered in the developing sleeve.

Description

BACKGROUND OF THE INVENTIONField of the Invention[0001]The present invention relates to an image forming apparatus, such as a copier and a printer, which executes image formation by applying an image-forming process including a step of charging an image bearing member, such as an electrophotographic photoreceptor and an electrostatic recording dielectric, to exhibit a prescribed polarity or potential.Description of the Related Art[0002]Conventionally, many image forming apparatuses using an electrophotographic system adopt a process cartridge system. In a process cartridge system, a rotatable photosensitive member and processing device which acts on the photosensitive member are integrated into a cartridge so as to be attachable to and detachable from an apparatus main body of an image forming apparatus.[0003]According to the process cartridge system, since a user can personally perform maintenance of the apparatus without having to rely on service personnel, operability can be dram...

Claims

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Application Information

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IPC IPC(8): G03G15/06G03G15/08
CPCG03G15/5045G03G15/065G03G15/14G03G15/0865G03G15/0806G03G15/5037G03G15/556G03G21/0064
Inventor IWAYAMA, HIROYOSHISUNAHARA, SATOSHI
Owner CANON KK
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